Manufacture of cement from furnace-slag.



W. LESSING; MANUFACTURE 01 CEMENT'FPLO FURNACE SLAG.

APPLICATION FILED AU(.

Pat-8111611 July 18, 1911.

Wil /2 6558.5.

nisrrnn saiarn WILHELM LESSING, or mnoxsnonr, GERMANY.

I. MANUFACTURE or CEMENT rnom FURNACE-SLAG.

To all wlwm it may concern. Be it known that I, WILHELM Lnssmo, asubjectof the German 'Empero r, residing at Troisdorf, Bheinland, in Germany,have in- 5 vented certain new, and useful Improvements in -the.Manufactured Cement from Furnace-Slag,- of

specification. a 5 This inventionrelates to an improved method for themanufacture t cement from' liquid furnace slag or' the like.

' In the specification of United Stateslab' ent No. 786,573 a 'processoimanufacturing cement is described wherein furnace slag is pulverizedtogether with-an admixture. of'a substance or substances, such asli1ne,'- the pulverizationbeing efi'ected by means of a rapidly rotatingdisintegrating drum or w wheel. revolving on a 'horizontal ,'axle,- .ByI 0 reason of the high speed of rotation of the. .drum' or wheelstrongair currents are, produced which scatter or blow away. aconsiderable proportion of the admixture, which consequently does notcome into contact 5 with the slag, and is not absorbed by same,

The present invention obviates this disadvantage by providing apluralityof suitably arra'ngeddisintegrating wheels, so that the slag is thrownfrom one toan'other. V The annexed drawings diagrammatically illustratethe manner in which this 'is done.

Referring to Figure l, the drum 4: has behind it another'drum a and athird drum a is arranged above'the drums wand o The glowing liquid slagisconducted to the drum a, by a trough or channel I), and the admixtureis 'led through a trough or channel 0 terminating near the circumferenceof the said drum. This drum pulverizes the material in the known manner,and throws part of it against the drum a and part of it against the -.upp er drum 0, The drums a and a rotate the direction'indicated in, thedrawing by the arrows, so that the 'ma-' terial on which they actis-thrown from one to the other, andis in this manner very intimatelymixed: The repeated impact of the, material against the rapidlyrotatingdrums causes it to be'reduced to a muchifiner state ofpulverization.than.heretofore,=.and owing to the fact that theingredients are brought into more intimate contact with each other abetter agglomerationresults.

i If the temperature of he slag. is very Specification of Lettersratent;

Application filed Au ust 14, 1908, Serial No. 448,543.

which the following is; a

drums act upon the already treated material brought into close contactwith each other and atomiz'ed.

"cooling, but forms hard lumps. If liquid high, or the stream of slag isvery powerful,

PatentedJuly 18, 1911.

it is advisable to providebeyond the drums a and q additional,si'milarly arranged drums a a as shown in Fig. 2,50 that the mixturetravels as it were over a train of rolls. The fact that at a suitableheightco above thelower drums a, a, a there'are drums a afrotating m theopposite direction efiectively prevents the blowing away and scatteringof the substance added to the' slag, since each pair of drums in theseries has a suctional effect uporrth e material, whereas in the case ofa single drum the effect is, of-c'ourse, dispersive. With thearrangement shown in .Fig. 2 the additional projected fromthecircumferences of the preceding drums;v so that the mixing and aglornerating action is rendered still more e ective, the ingredientsbeing repeatedly As is known, furnace slag which has not been granulated'in' waterand has 'a high percentage of lime crumbles, on cooling, to

so-called-slag meal, which is practically useless tor the manufacture ofcement. But furnace slag which is poor in lime, that is to say, slagcontaining not more than about 47 per cent. oflime, does not crumble onfurnace slagof this kind, that is to say slag which is poor in lime,becomes saturated with lime in the course of the process to which thisinvention relates,. and is not sufficiently cooled sufficiently quickly,'the lumps formed on cooling crumble in partto powder, and this powder,though suitable for cement, is not so valuable as if the material hadbeen more rapidly cooled during the treatment. It the cooling issufficiently rapid, durable lumps are formed, which do not-crumble bythemselves but have to be ound or crushed, and then furnish a. cement ofbetter quality. Y

If the flow of slag is so powerful, or its temperature so high, that themixture is not. sufficiently cooled by the air during. the pulverizingor atomizing process, it is'co'oled artificially. This can be effectedby introducing a suitable qua tity of cooling liquid .1

directly after the pulerizing process. For this purpose the last of thelower drums.-

may be arranged somewhat'beyond theup-l per. drum or the last of theupper drums,; and cooling liquid may be allowed to fall on theprojecting drum in the form of a fine spray, for example from a rose d.The cooling liquid is thus atomized and enters the mixture in a finelydivided state, so that the cooling is not only accelerated, but also renfdered more uniform.. If, .for this purpose,

. liquids-are used which contain the requisite admixtures in solution,for example lime- Watcr, lime-lye or other alkaline solutions,

' the mixture is further enriched withcementforming raw materials, in avery finely 'divided and uniformly distributed state At the same timethe subsequent swelling of the cement is prevented. Thelatter effect mayhe still more efticaciously prevented by adding barium salt solutionsand barium from liquid furnace slag consisting in subijecting' the slagin a divided condition to repeated impacts in the presence of an aeriform current carrying additional cement forming material. 1 i

2. The method of manufacturing cement from liquid furnace slagconsisting in subjecting thesla'g in adivided' condition to repeatedimpacts in the presence of an aeriform current carrying additionalcement ,formin material" and subse uentl a l z: q l PPIY in cool1n l1uid thereto.

3. The method of manufacturing cement from liquid furnace slagconsisting in subjecting the slag in a divided c ondition to repeatedimpacts in the presence of an 'aeri-' form current carrying additionalcement forming material and subsequently applynesses.

ing water containing cement improving material thereto.

4. The method of manufacturing cement from-liquid furnace slagconsisting in repeatedly projecting the slag ,in a divided condition bsuccessive impacts across the direction 0. an'aeriform current carryingadditional cement forming material.

5. The method of-manufacturing cement from liquid furnace slagconsisting in repeatedly projecting the slag in'a divided conditionbysuccessive impacts across the y direction of an aeriform currentcarrying powdered lime in suspension.

6. The method of manufacturing cement;

from liquid furnace slag consisting in repeatedly projecting the slag ina'divided condition bty successive impacts across the direction 0 anaeriform current carrying additional cement forming material andsubsequently applyin cooling liquid thereto, 7.- The method ofinanufacturing cement from liquid furnace slag consisting in repeatedlyprojecting the slagin a divided condition by successive impacts acrossthe direction of an aeriform current, carrylng additional cement formingmaterial and subsequently applying water containing cement improvingmaterial thereto.

' '8. The method of manufacturing cement from liquid furnace slagconsisting in repeatedly projecting the slag in a divided condition bfysuccessivefimpacts across the direction 0 -an aeriform current carryingpowdered lime in suspension .and subse quently applying water containingcement.

improving material thereto.

In witness whereof-I ha've'signed this specification in the presence oftwo wit- WILHELM LESSING.

Witnesses:

Louis VANDORN, H. S'rELzEii.

